The idea that teachers’ test-based productivity does not improve after their first few years in the classroom is, it is fair to say, the “conventional wisdom” among many in the education reform arena. It has been repeated endlessly, and used to advocate forcefully for recent changes in teacher personnel policies, such as those regarding compensation, transfers, and layoffs.
Following a few other, recent analyses (e.g., Harris and Sass 2011; Wiswall 2013; Ladd and Sorensen 2013), a new working paper by researchers John Papay and Matthew Kraft examines this claim about the relationship between experience and (test-based) performance. In this case, the authors compare the various approaches with which the productivity returns to experience have been estimated in the literature, and put forth a new one. The paper did receive some attention, and will hopefully have some impact on the policy debate, as well as on the production of future work on this topic.
It might nevertheless be worthwhile to take a closer look at the “nuts and bolts” of this study, both because it is interesting (at least in my opinion) and policy relevant, and also because it illustrates some important lessons regarding the relationship between research and policy, specifically the fact that what we think we know is not always as straightforward as it appears.